To the guy that asked about the legality of the search, it is legal incident to the arrest for the DUI. Meaning, I have a responsibility to inventory the contents of the vehicle whenever we tow a vehicle. For liability reasons so they don't pick uptheir car and claim the envelope of 5,000 bucks is somehow missing.
When you inventory the vehicle, you are allowed to search everything inside the vehicle that is unsecured, meaning not locked. If the glovebox is locked, that's a grey area, i would probably open it, but something like a lockbox or something like that, that is locked, I would need a warrant, and have to have a good reason to suspect that there would be something illegal inside the box.
Anything illegal you find as a result of this search can be siezed and they can be charged for whatever you find.